She appeared on MBC “Human Documentary” on February 15, and revealed that the reason for fainting was because of swine flu (H1N1).

Right after Girl’s Day concluded their performance of “Something” on January 16, Hyeri fainted on stage and had to be carried off stage by staff members. Hyeri had not shown any signs of weakness during the performance itself.

She revealed, “It was swine flu. That was the sickest I’ve ever been in my life.”

Hyeri said that she remembered when the performance started but couldn’t remember anything after the first chorus. “I was sick at that time, but I wanted to be on stage for the performance. I know how precious each performance is. It wouldn’t be right to not to appear for the sake of the fans, and I would have been sorry to the members.”